The largest list of Walther P22 / P99 Airsoft Manuals. UMAREX, UMAREX Walther P99 Gas Fixed Slide Manual. UMAREX, UMAREX Walther CO2 P99 Manual.If, after a fall, the hammer was released,. then the firing pin would not be activated. 1. Manual safety. To engage the safety, turn P22 Standard Conversion Kit. Allows the conversion from. Target to Standard version. Barrel length 87 mm art.-no.: 512.502. Bridge mount. Fits the WALTHER